Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: Help my team stay on track to meet our fundraising goal!  Responser: I sent a contribution to you last week. Wish I could do more.

Mixed